Feline Sarcoma Virus (FeSV) is a retrovirus that primarily affects cats, posing a significant health concern within the feline population. Belonging to the family Retroviridae, FeSV is known for its ability to induce the formation of sarcomas, a type of cancerous tumor, in infected cats. The virus is transmitted horizontally among cats through close contact, often during aggressive interactions or through bite wounds. FeSV can also be transmitted vertically from an infected mother to her offspring during birth or through nursing. Upon infection, the virus integrates its genetic material into the host's DNA, leading to the disruption of normal cellular functions and the eventual development of tumors. Sarcomas associated with FeSV are commonly found at injection sites, suggesting a link between the virus and certain vaccines. Unfortunately, there is no specific antiviral treatment for FeSV, and management primarily focuses on supportive care and addressing the symptoms. Prevention strategies include minimizing exposure to infected cats and implementing proper vaccination protocols. Research efforts are ongoing to better understand the molecular mechanisms of FeSV infection and to develop effective preventive measures. The study of FeSV not only contributes to feline health but also provides insights into retroviral infections and tumorigenesis in general. As our understanding of this virus advances, new avenues for treatment and prevention may emerge, offering hope for the well-being of cats in the future.